kPa to Atmospheres Converter
Convert kilopascals to standard atmospheres — 101.325 kPa makes exactly one atmosphere. Results update as you type; exact factors shown.
One kilopascal is 0.0099 standard atmospheres — see the exact factor, not a rounded rule of thumb.
How the kpa to atmospheres converter works
Pressures convert through the pascal (1 N/m²). One bar is exactly 100 kPa; a standard atmosphere is exactly 101.325 kPa; 1 psi is 6.894757 kPa (a pound-force on a square inch); 1 mmHg is 133.322 Pa by the conventional definition.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common pressure conversions
| From | To | Units |
|---|---|---|
| 10 kPa | 0.0987 atm | kilopascals to standard atmospheres |
| 25 kPa | 0.2467 atm | kilopascals to standard atmospheres |
| 50 kPa | 0.4935 atm | kilopascals to standard atmospheres |
| 75 kPa | 0.7402 atm | kilopascals to standard atmospheres |
| 100 kPa | 0.9869 atm | kilopascals to standard atmospheres |
| 101.325 kPa | 1 atm | kilopascals to standard atmospheres |
| 150 kPa | 1.4804 atm | kilopascals to standard atmospheres |
| 200 kPa | 1.9738 atm | kilopascals to standard atmospheres |
| 250 kPa | 2.4673 atm | kilopascals to standard atmospheres |
| 300 kPa | 2.9608 atm | kilopascals to standard atmospheres |
| 500 kPa | 4.9346 atm | kilopascals to standard atmospheres |
| 1,000 kPa | 9.8692 atm | kilopascals to standard atmospheres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in pascals |
|---|---|---|
| pascal | Pa | 1 pascal |
| kilopascal | kPa | 1,000 pascal |
| megapascal | MPa | 1,000,000 pascal |
| bar | bar | 100,000 pascal |
| millibar (hectopascal) | mbar | 100 pascal |
| standard atmosphere | atm | 101,325 pascal |
| pound per square inch | psi | 6,894.757293168 pascal |
| millimeter of mercury | mmHg | 133.322387415 pascal |
| inch of mercury | inHg | 3,386.389 pascal |
FAQFrequently asked questions about pressure conversion
How many kPa in one atmosphere?
Exactly 101.325 kPa.
What is 200 kPa in atm?
1.974 atm.
Why is the pascal so small?
One pascal is one newton per square meter — roughly the pressure of a sheet of paper resting on a table, so everyday pressures run to thousands of them.
What is normal atmospheric pressure in kPa?
101.325 kPa at standard conditions; weather systems move it between about 96 and 105 kPa.
Which unit do tyre gauges use?
kPa in metric countries, psi in the US and often both on the same gauge.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.